SmogRank / History / City race
Cities in Czechia, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Czechia for PM2.5 over the 30 days to 21 Nov 2023: Děčín 13.7 µg/m³, Beroun 11.0 µg/m³ and Moravská Třebová 10.7 µg/m³.
- 1DěčínÚstí nad Labem Region13.7
- 2BerounCentral Bohemia11.0
- 3Moravská TřebováPardubice Region10.7
- 4OlomoucOlomouc Region10.4
- 5BohumínMoravian-Silesian Region10.3
- 6HavířovMoravian-Silesian Region10.0
- 7OstravaMoravian-Silesian Region9.5
- 8Ústí nad LabemÚstí nad Labem Region9.3
- 9ZnojmoSouth Moravian9.1
- 10StudénkaMoravian-Silesian Region9.1
- 11PřerovOlomouc Region9.1
- 12TepliceÚstí nad Labem Region9.0
- 13LitvínovÚstí nad Labem Region8.8
- 14Valašské MeziříčíZlín8.5
- 15Český TěšínMoravian-Silesian Region8.3
- 16PardubicePardubice Region8.1
- 17MostÚstí nad Labem Region8.1
- 18Mladá BoleslavCentral Bohemia8.1
- 19ZlínZlín8.0
- 20Frýdek-MístekMoravian-Silesian Region8.0
+ 11 more cities, 8.0 µg/m³ and below
Not counted on this day, too few days measured: Prague since 21 Nov 2023, Rokycany since 13 Nov 2023, Sokolov since 4 Nov 2023 and 2 more cities.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.